Turbine running-wheel.



PATENTND JUNE 11, 19o?.

c. A. BAGKSTRVOM. TURBINB RUNNING WHEEL. PP-LIUTI-ON FILED APR-13, 1904. BBNEWBD APB. 19, 1907.

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uNrrnD srirrnsl PATENT ormoni.

CHARLES A. BACKSTROM, OF MILWAUKEE, WISCONSIN, ASSIGNOR TO BACK- STROM-SMITII STEAM TURBINE 8c MANUFACTURING COMPANY, A COR- PORATION OF WISCONSIN.

TUBBINE RUNNING-WHEEL.

Speccaton of Letters Patent.

Patented June 11, 1907.

Application filed April 13, 1904. Renewed April 19, 1907. Serial No. 369.116.

T a/ZZ whom t may con/067%:

Be it known that I, CHARLES A. BACK- sTnoM, a citizen of the United States, residing at Milwaukee, county of Milwaukee, and

The object of my invention is to provide a form of construction in which the cost of assembling will be reduced to a minimum and which will possess a maximum degree of strength for a given weight of material.

In the following description reference iS' had to the accompanying drawing in which Figure 1 is a detail view, in cross section, of a portion of the turbine embodying my invention. Fig. 2 is a detail longitudinal view of the same showing two of the running wheels. Fig. 3 is a detail sectional view of one of the vanes showing the relation of the retaining bolts or rivets to the walls of the vanes.

Like parts are identified by the same reference characters.

1 is the turbine shaft and 2 ing. U

3 is a nozzle ring encircling a running wheel and forming part of a partition of which one member 4 extends outwardly to the casing and another member 5 extends inwardly to the hub of the running wheel. v

8 is a valve ring encircling the nozzle ring and controlling the delivery of motive fluid to the running wheel through nozzle apertures 9.

The running wheel comprises a central hub 10 keyed to the shaft at 11 and provided with an outwardly projecting portion 13 to which disks 14 are secured by means of bolts or rivets 15. Vanes 16 are secured between the outer edges of the disks by bolts or rivets 17, the vanes being formed with converging front and rear walls, between which the rivets pass, as shown in Fig. 2. Two rivets are used to hold each vane' in position, the same being so located that they will contact with both walls of the vane. The respective rivets occupy positions on opposite sides of the central or larger portion of the space inclosed by the vane walls.

the outer casl vanes they are substantially parallel. of the disks is provided with apertures 24 be- The outer edges of the disks are beveled inwardly in the direction of the vanes as shown, whereby the motive fluid will be directed to the vanes, even though the latter are not in exact registry with the mouths of the nozzles. The disks 14 are connected at an intermediate point by rivets 20, which pass through spacing blocks, 21, preferably composed of a 'short section of tubing. The disks 14 converge from the hub to the spacing blocks 21 and between the spacing blocks 21 and the Each tween the hub and the circle occupied by the spacing blocks 2l. These apertures permit of a free delivery of motive fluid to both sides of the wheel. The projecting end of the hub is reduced at and a packing ring 26 is slipped on to the reduced portion of the hub andbears against the wall of the central aperture in the partition member 5. The packing ring is held in position by the hub of the adjacent running wheel, which abuts the acking ring as shown in Fig. 1.

With the above described construction it will be observed that the motive fluid is delivered inwardly from the vanes and received between the parallel portions of the disks which form the sides of the running wheel. After the full reactionary force of the fluid has been expended upon the vanes the fluid passes inwardly beyond the spacing blocks 21, where it is permitted to flow with the utmost freedom to and through the apertures 24 in the sides of the wheel.

It will thus be observed that all the advantages in efficiency of a running wheel having an interior cavity with parallel sides are secured and at the same time all the advantages in strength of running wheels having converging side walls are also secured.

The peculiar construction of the wheel hubs and their packing rings enables the parts to be assembled with the least possible labor, as each hub and its packing ring abuts the hub and packing ring of the adjacent wheel and serves to hold the hub and packing ring of said wheel in position within the turbine casing, thus dispensing with all special holding devices as all the parts are mutually supporting.

Having thus described my invention, what I claim as new and Patent, is V 1. A turbine running wheel, comprising a central hub, disks connected therewith, and provided with a series of' vanes at their outer edges arranged to deliver motive fluid to the space between the disks, said disks having side walls converging from the hub to an intermediate point and extending therefrom in substantially parallel planes to the vanes.

2. A turbine running wheel comprising a central hub, disks connected therewith,vanes secured between the outer portions of the disks and arranged for an inward'delivery of motive fluid to the space between the disksl and spacing devices located at an intermediate point between the vanes andthe hub, said disks being apertured and arranged to converge from the head to the spacing devices and being substantially parallel from the spacing devices to the vanesi 3. In a turbine, a set oirunning wheels, each having a hub provided with a reduced' desire to secure by Letters walls, holding end a nozzle partition having an aperture into which said reduced end portion of the hub extends; a split packing ring iitted to the reduced portion of the hub and arranged to bear against the partition, each of said packing rings being held in position abutting the larger portion of the corresponding hub, by the hub of adjacent running wheel.

4. A turbine running wheel having disks composing its side walls; a set of vanes located between the outer portions of the disks, and having converging front and rear devices passing through the disks and between the said converging walls of the vanes in contact with both the front and rear walls on opposite sides respectively, of the central space between the walls. In testimony whereof I affix ymy signature in the presence of two witnesses.

CHARLES A. BACKSTROM. Witnesses:

JA's. B. ERWIN, LEVERETT C. WHEELER. 

